I'm the same as Blue - racing thoughts at night usually mean I'm in a bad place (stressed, anxious or the bad kind of hypo-manic). Sometimes when I know I'm not going to be able to sleep because of racing thoughts I'll take a sleep aid. Also, reading a book sometimes helps me stop thinking about the things that keep me awake...

Like Blue said, I would definitely talk to a pdoc as he/she can help you figure out what course of action to take